Python

I. Introduction of Python1.1 Python Introduction1.2 Python AppIi. History of Python developmentThird, Python 2.X vs python 3.X3.1 Overview3.2 Detailed Differences1) Coding problem python3.x No need to specifically specify UTF-8, UTF-8 encoding is

Ternary operationsTernary operators are often referred to as conditional expressions in Python, and these expressions are based on true (TRUE)/False (not) criteria, and the ternary operation is only possible with Python above 2.4.Syntax format:X if

I. Set set of data basic typesSet is similar to Dict and is a set of keys, but does not store value. Because key cannot be duplicated, there is no duplicate key in setSet set, which is an unordered and non-repeating collection of elements1. Creates =

The boost library is a good support for C + + command-line parsing, which makes our programs more cool to use. I've been trying to use the command line in Python recently, so I don't have to change the input parameters in the IDE. Remember the

1. Logging module Log levelA simple example of using the logging module:>>>import logging>>>logging.debug ("This ' s a Test Logging") >>>loggin.info ("Still a test Logging ") # The above two lines do not have output by default, you need to specify

Development environment EnvironmentSystem: WINDOWS10 x64Development tools: python2.7 +qrcodeRecently found a very useful tool, mind map, can let us establish a clear idea, I personally prefer to use XMIND6, so the environment is built using mind Map

A statement block is a set of statements that executes or executes multiple times when the condition is true. You can create a statement block by placing a space in front of the code to indent the statement. Each row in a statement block should be

NumPy use1. Using the array to define the matrixDataSet = Array ([[[1.0,1.1],[1.0,1.0],[0.0,0.0],[0,0.1]])2. Number of rows (columns) using shape to return a matrixDataset.shape[0] #4DATASET.SHAPE[1] #23. Multiply the matrix with tilesIntX =array ([0

I learned python the other day and completed most of the exercises in the Python workbook: Https://github.com/Show-Me-the-Code/python (I have the exercise code on GitHub, welcome pickup). After seeing a Python crawler project in @salamer, I felt

First, recursive functionConcept: recursive algorithm is a direct or indirect process of invoking its own algorithm. In computer programming, recursive algorithm is very effective to solve a large class of problems. Characteristics:① recursion is

Chinese output#-*-coding:utf8-*-ImportRequestsImportRetimeout= 8Headers= {'user-agent':'mozilla/5.0 (Windows NT 6.3; Win64; x64) applewebkit/537.36 (khtml, like Gecko) chrome/41.0.2272.118 safari/537.36'}defBanner (URL):Try: HTML= Requests.get

In the development of the project, in order to facilitate debugging code, often to stdout output some logs, the default of these logs are directly displayed in the terminal. And the general application server, third-party libraries, and even some of

The role of decode is to convert other encoded strings into Unicode encodings, such as Str1.decode (' gb2312 '), to convert gb2312 encoded string str1 into Unicode encoding.The role of encode is to convert Unicode encoding into other encoded strings,

I. Basic data typesInteger: intString: str (note: \ t equals a TAB key)Boolean value: BOOLListing: Listlist with []Ganso: TupleFor Ganso ()　　Dictionary: DictNote: All data types exist in the class column that you want to correspond to, Ganso and

1. Type () to see the types of variables. >>> Type (12.1)class 'float'>>>> Type ('Hello')class 'Str'>>>> Type (2)class 'int'>>>> Type ('2')class 'Str'>2. Python 's variable names support numbers, letters, and underscores, but cannot start with a

Write your own calculator one, function analysisThe user enters a similar expression like this (4+ 50)-((100 + 40) *5/2-3*2* 2/4+9) * ((((3 + 4)-4)-4), assuming that the expression contains no special symbols except spaces, ' + ', '-', ' * ', '/',

Def show (*arg): Print (Arg,type (ARG))Show ([11,22],[33])Results: ([one, one], []) Conclusion: A parameter passed by a * is defined by default as Ganso typeDef show (**arg): Print (Arg,type (ARG))Show (k1= ' v1 ', k2= ' v2 ', k3= ' v3

Main content: Web framework, Django FoundationWeb FrameworkWeb Request Flow--Original web Framework--Customizing the web framework--MVC and MTV#Models views Controllers#function of template processing request#MVC#Models Templates views#function of

For beginners, it is important to get these properties and methods if you are not very familiar with the object or the library is God Horse.The variable name, which is usually prefaced with a double underscore, is a naming pattern used to represent

When writing scripts, the system commands are often executed directly.First, the Os.system () command is used.Import Osos.system ("cat/etc/hosts")However, this method does not get the output and return values.Two. Then I used the Os.popen ()